Title:
OPTICAL AMPLITUDE MODULATING SYSTEM CAPABLE OF REMOVING HIGH-ORDER COMPONENT
Document Type and Number:
WIPO Patent Application WO/2007/026759
Kind Code:
A1
Abstract:
A DSB-SC system in which the tertiary component is suppressed. IN a DSB-SC modulating system (1) of a first aspect, a third harmonic signal generating section (17) generates an electric signal (3fm) having a frequency which is three times the frequency of a fundamental signal (fm), a phase adjusting section (18) adjusts the difference between the phases of the fundamental signal (fm) and an electric signal (3fm) having a frequency which is three times the frequency of the fundamental signal, and a signal intensity adjusting section (19) adjusts the intensity of the electric signal (3fm). As a modulating signal, the signal having a frequency 3fm is adjusted so that the phase of the primary component (f0±3fm) may be opposite to that of the tertiary component (f0±3fm) generated when a signal of fm is applied as a modulating signal and that the intensity of the primary component (f0±3fm) may be approximately equal to that of the tertiary component (f0±3fm). Therefore, they suppress each other, and DSB-SC modulation having a high extinction ratio can be achieved.
Inventors:
KAWANISHI TETSUYA (JP)
IZUTSU MASAYUKI (JP)
SAKAMOTO TAKAHIDE (JP)
TSUCHIYA MASAHIRO (JP)
IZUTSU MASAYUKI (JP)
SAKAMOTO TAKAHIDE (JP)
TSUCHIYA MASAHIRO (JP)
Application Number:
PCT/JP2006/317098
Publication Date:
March 08, 2007
Filing Date:
August 30, 2006
Export Citation:
Assignee:
NAT INST INF & COMM TECH (JP)
KAWANISHI TETSUYA (JP)
IZUTSU MASAYUKI (JP)
SAKAMOTO TAKAHIDE (JP)
TSUCHIYA MASAHIRO (JP)
KAWANISHI TETSUYA (JP)
IZUTSU MASAYUKI (JP)
SAKAMOTO TAKAHIDE (JP)
TSUCHIYA MASAHIRO (JP)
International Classes:
G02F1/03; G02F1/01; G02F1/015; G02F1/035; H04B10/2507; H04B10/516; H04B10/54; H04B10/61
Foreign References:
| JPS6313017A | 1988-01-20 | |||
| JPS635306A | 1988-01-11 | |||
| JP2003234703A | 2003-08-22 | |||
| JP2004077835A | 2004-03-11 |
Other References:
KAWANISHI T. ET AL.: "Hikari FSK Henchoki o Mochiita Cho Koshokohi Hikari Kyodo Hencho", IEICE TECHNICAL REPORT, vol. 105, no. 243, 19 August 2005 (2005-08-19), pages 41 - 44, XP003013272
KAWANISHI T. AND IZUTSU M.: "Linear Single-Sideband Modulation for High-SNR Wavelength Conversion", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 16, no. 6, June 2004 (2004-06-01), pages 1534 - 1536, XP011113268
KAWANISHI T. ET AL.: "High-Speed Optical FSK Modulator for Optical Packet Labeling", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 23, no. 1, January 2005 (2005-01-01), pages 87 - 94, XP001227312
See also references of EP 1921485A4
TETSUYA KAWANISHI ET AL.: "Analysis and application of FSK/IM simultaneous modulation", TECH. REP. OF IEICE. EMD 2004-47, CPM 2004-73, OPE 2004-130, LQE 2004-45, August 2004 (2004-08-01), pages 41 - 46
T. KAWANISHI; M. IZUTSU: "Suppression of Optical Harmonics in Wavelength Conversion using Optical Single-Sideband Modulator", OPTICAL FIBER COMMUNICATION CONFERENCE (OFC) POSTCONFERENCE DIGEST, 23 March 2003 (2003-03-23)
TRENDS IN OPTICS AND PHOTONICS SERIES (TOPS), vol. 86, 23 March 2003 (2003-03-23), pages 771 - 772
T. KAWANISHI; M. IZUTSU: "Linear Single-Sideband Modulation for High-SNR Wavelength Conversion", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 16, no. 6, 1 June 2004 (2004-06-01), pages 1534 - 1536, XP001211213, DOI: doi:10.1109/LPT.2004.827112
T. KAWANISHI ET AL.: "Ultra High Extinction Ratio Intensity Modulation using Optical FSK Modulator", IEICE TECHNICAL REPORT, vol. 105, no. 243, 19 August 2005 (2005-08-19), pages 41 - 44, XP003013272
KAWANISHI T. AND IZUTSU M.: "Linear Single-Sideband Modulation for High-SNR Wavelength Conversion", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 16, no. 6, June 2004 (2004-06-01), pages 1534 - 1536, XP011113268
KAWANISHI T. ET AL.: "High-Speed Optical FSK Modulator for Optical Packet Labeling", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 23, no. 1, January 2005 (2005-01-01), pages 87 - 94, XP001227312
See also references of EP 1921485A4
TETSUYA KAWANISHI ET AL.: "Analysis and application of FSK/IM simultaneous modulation", TECH. REP. OF IEICE. EMD 2004-47, CPM 2004-73, OPE 2004-130, LQE 2004-45, August 2004 (2004-08-01), pages 41 - 46
T. KAWANISHI; M. IZUTSU: "Suppression of Optical Harmonics in Wavelength Conversion using Optical Single-Sideband Modulator", OPTICAL FIBER COMMUNICATION CONFERENCE (OFC) POSTCONFERENCE DIGEST, 23 March 2003 (2003-03-23)
TRENDS IN OPTICS AND PHOTONICS SERIES (TOPS), vol. 86, 23 March 2003 (2003-03-23), pages 771 - 772
T. KAWANISHI; M. IZUTSU: "Linear Single-Sideband Modulation for High-SNR Wavelength Conversion", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 16, no. 6, 1 June 2004 (2004-06-01), pages 1534 - 1536, XP001211213, DOI: doi:10.1109/LPT.2004.827112
T. KAWANISHI ET AL.: "Ultra High Extinction Ratio Intensity Modulation using Optical FSK Modulator", IEICE TECHNICAL REPORT, vol. 105, no. 243, 19 August 2005 (2005-08-19), pages 41 - 44, XP003013272
Attorney, Agent or Firm:
KOBAYASHI, Hiroshi et al. (IKUBO & KATAYAMA Fukuoka Bldg. 9th Fl., 8-, Yaesu 2-chome Chuo-ku Tokyo 28, JP)
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